CN115927954A - Method for improving impact toughness of weathering resistant steel - Google Patents
Method for improving impact toughness of weathering resistant steel Download PDFInfo
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- CN115927954A CN115927954A CN202211364603.0A CN202211364603A CN115927954A CN 115927954 A CN115927954 A CN 115927954A CN 202211364603 A CN202211364603 A CN 202211364603A CN 115927954 A CN115927954 A CN 115927954A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 title claims description 69
- 239000010959 steel Substances 0.000 title claims description 69
- 238000005096 rolling process Methods 0.000 claims abstract description 52
- 238000007670 refining Methods 0.000 claims abstract description 22
- 238000009749 continuous casting Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 14
- 229910000870 Weathering steel Inorganic materials 0.000 claims abstract description 13
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000012937 correction Methods 0.000 claims abstract description 3
- 238000005520 cutting process Methods 0.000 claims abstract description 3
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 238000004321 preservation Methods 0.000 claims abstract description 3
- 238000010008 shearing Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 36
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 14
- 238000002791 soaking Methods 0.000 claims description 11
- 229910052786 argon Inorganic materials 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000005261 decarburization Methods 0.000 claims description 9
- 230000023556 desulfurization Effects 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 9
- 238000010583 slow cooling Methods 0.000 claims description 9
- 238000009489 vacuum treatment Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 4
- 150000002910 rare earth metals Chemical class 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000009847 ladle furnace Methods 0.000 description 14
- 239000000126 substance Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for improving the impact toughness of weathering steel, which comprises the following process flows: desulfuration → converter smelting → LF refining → RH refining → slab continuous casting; heating a plate blank → descaling with high pressure water → a fixed width press → rolling of an E1R1 roughing mill → rolling of an E2R2 roughing mill → a heat preservation cover → cutting of a flying shear head and tail → descaling with high pressure water → rolling of an F1-F7 finishing mill → cooling of an encryption type laminar flow → thermal correction → shearing → flaw detection → sign → warehousing. The weathering steel has the characteristics of good corrosion resistance and high toughness, can be widely applied to the fields of photovoltaic supports, vehicles, bridges, buildings and the like, and has the advantages of effectively saving maintenance cost, improving construction efficiency and the like.
Description
Technical Field
The invention relates to the technical field of metallurgical plate production, in particular to a method for improving impact toughness of weathering resistant steel.
Background
The added alloy elements such as copper, phosphorus, chromium, nickel and the like are enriched in the internal rust layer, so that the internal rust layer of the weathering steel is obviously denser than that of carbon steel. Compared with common carbon steel, the weathering steel exposed in a proper environment can gradually form a compact and stable rust layer as a barrier for inhibiting a corrosion process, so that the coating requirement can be avoided, the weathering steel can be used as a structural member for outdoor use, the power load resistance of a steel structure can be effectively improved by adding the rare earth La, and cracks and brittle fracture are avoided.
Disclosure of Invention
The invention aims to provide a method for improving the impact toughness of weathering steel, the weathering steel has the characteristics of good corrosion resistance and high toughness, can be widely applied to the fields of photovoltaic supports, vehicles, bridges, buildings and the like, and has the advantages of effectively saving maintenance cost, improving construction efficiency and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for improving the impact toughness of weathering resistant steel, which comprises the following process flows:
desulfuration → converter smelting → LF refining → RH refining → slab continuous casting;
heating a plate blank → descaling with high pressure water → a fixed width press → rolling with an E1R1 roughing mill → rolling with an E2R2 roughing mill → a heat preservation cover → cutting head and tail with a flying shear → descaling with high pressure water → rolling with an F1-F7 finishing mill → cooling with an encrypted laminar flow → thermal correction → shearing → flaw detection → sign → warehousing;
the main process parameters are as follows:
1) And smelting in a converter
The molten steel for the casting machine comprises the following components: 0.06-0.11% of C, si:0.10 to 0.40%, mn:0.70-1.10%, P is less than or equal to 0.030%, S: less than or equal to 0.020%, cu:0.20-0.32%, cr 0.25-0.30%, ni:0.10-0.15%, rare earth La:15-25ppm;
2) Hot rolling of the steel
The discharging temperature of the casting blank is 1220 plus or minus 20 ℃, and the rough rolling adopts a 3+3 mode; the furnace time is 220-250min, the soaking time is 30-60min, the rough rolling and final rolling temperature is not less than 1040 ℃, the finish rolling start temperature is 930 +/-10 ℃, and the finish rolling temperature is 840 +/-10 ℃; the thickness of the hot rolled steel strip is 12mm; laminar flow cooling equipment is adopted for cooling, a front dispersion cooling mode is adopted, and the coiling temperature is 580 +/-20 ℃.
Further, carrying out desulfurization pretreatment on the molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blowing converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter; then, carrying out LF (ladle furnace) external refining on the molten steel smelted by the converter, and carrying out RH vacuum treatment on the molten steel after the LF external refining; carrying out slab continuous casting with the superheat degree of 18 ℃, and then carrying out slab cleaning, slow cooling and continuous casting billet quality inspection; obtaining a plate blank with the thickness of 250 mm; the heating temperature is 1210 ℃, the furnace time is 235min, the soaking time is 35min, the rough rolling finishing temperature is 1055 ℃, the finishing rolling starting temperature is 928 ℃, the finishing rolling temperature is 843 ℃, and the thickness of the finished steel plate is 12mm; the cooling speed of the steel plate is 10 ℃/s, and the coiling temperature is 583 ℃.
Further, carrying out desulfurization pretreatment on the molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blowing converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter; then, carrying out LF external refining on the molten steel smelted by the converter, and carrying out RH vacuum treatment on the molten steel after the LF external refining; carrying out slab continuous casting with the superheat degree of 20 ℃, and then carrying out slab cleaning, slow cooling and continuous casting billet quality inspection; obtaining a plate blank with the thickness of 250mm, wherein the heating temperature is 1220 ℃, the furnace time is 228min, the soaking time is 34min, the rough rolling and final rolling temperature is 1055 ℃, the finish rolling initial rolling temperature is 932 ℃, the final rolling temperature is 846 ℃, and the thickness of the finished product steel plate is 12mm; the cooling rate of the steel plate is 9 ℃/s, and the coiling temperature is 590 ℃.
Further, carrying out desulfurization pretreatment on the molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blowing converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter; then, performing LF external refining on the molten steel smelted by the converter, performing RH vacuum treatment on the molten steel refined outside the LF furnace, performing slab continuous casting, wherein the superheat degree is 20 ℃, and then performing slab cleaning, slow cooling and continuous casting slab quality inspection; obtaining a plate blank with the thickness of 250mm, wherein the heating temperature is 1223 ℃, the furnace time is 236min, the soaking time is 35min, the rough rolling final rolling temperature is 1058 ℃, the finish rolling initial rolling temperature is 933 ℃, the final rolling temperature is 846 ℃, and the thickness of the finished steel plate is 12mm; the cooling rate of the steel sheet was 9 ℃/s, and the coiling temperature was 592 ℃.
Compared with the prior art, the invention has the beneficial technical effects that:
the mechanical property and the technological property of the high-toughness weathering steel produced by the method meet the requirements of agreements signed by users; and the fracture microscopic region of the steel grade of the invention is shown in figure 1, the fracture fiber region presents the dimple characteristic, the morphology difference is not large, and the distribution of the dimple is uniform.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a microstructure diagram of example 1 of the present invention.
Detailed Description
The present invention is described in more detail below by way of specific examples. The examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
The implementation mode is as follows: the method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, carrying out RH vacuum treatment on the molten steel refined by the LF external refining to obtain smelting chemical components shown in the table 1, carrying out slab continuous casting with the superheat degree of 18 ℃, and then carrying out slab cleaning, slow cooling and continuous casting slab quality inspection. A 250mm thick slab was obtained with the chemical composition weight percentages shown in table 1. The heating temperature is 1210 ℃, the furnace time is 235min, the soaking time is 35min, the rough rolling finishing temperature is 1055 ℃, the finishing rolling starting temperature is 928 ℃, the finishing rolling temperature is 843 ℃, and the thickness of the finished steel plate is 12mm. The cooling speed of the steel plate is 10 ℃/s, and the coiling temperature is 583 ℃.
Example 2
The implementation mode is as follows: the method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, carrying out RH vacuum treatment on the molten steel refined by the LF external refining to obtain smelting chemical components shown in the table 1, carrying out slab continuous casting with the superheat degree of 20 ℃, and then carrying out slab cleaning, slow cooling and continuous casting slab quality inspection. A 250mm thick slab was obtained with the chemical composition weight percentages shown in table 1. The heating temperature is 1220 ℃, the furnace time is 228min, the soaking time is 34min, the rough rolling finishing temperature is 1055 ℃, the finishing rolling starting temperature is 932 ℃, the finishing rolling temperature is 846 ℃, and the thickness of the finished steel plate is 12mm. The cooling rate of the steel plate is 9 ℃/s, and the coiling temperature is 590 ℃.
Example 3
The implementation mode is as follows: the method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blowing converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, carrying out RH vacuum treatment on the molten steel refined by the LF external refining to obtain smelting chemical components shown in the table 1, carrying out slab continuous casting with the superheat degree of 20 ℃, and then carrying out slab cleaning, slow cooling and continuous casting slab quality inspection. A 250mm thick slab was obtained with the chemical composition weight percentages shown in table 1. The heating temperature is 1223 ℃, the in-furnace time is 236min, the soaking time is 35min, the rough rolling finishing temperature is 1058 ℃, the finish rolling starting temperature is 933 ℃, the finishing temperature is 846 ℃, and the thickness of the finished steel plate is 12mm. The cooling rate of the steel sheet was 9 ℃/s and the coiling temperature was 592 ℃.
TABLE 1 chemical composition (wt%) of inventive examples 1 to 4
| Examples | C | Si | Mn | P | S | Cu | Cr | Ni | La |
| 1 | 0.08 | 0.29 | 0.95 | 0.008 | 0.003 | 0.29 | 0.45 | 0.11 | - |
| 2 | 0.08 | 0.30 | 0.93 | 0.008 | 0.004 | 0.29 | 0.43 | 0.11 | 0.0020 |
| 3 | 0.09 | 0.31 | 0.93 | 0.009 | 0.004 | 0.30 | 0.44 | 0.11 | 0.0017 |
| 4 | 0.09 | 0.30 | 0.95 | 0.009 | 0.002 | 0.29 | 0.43 | 0.12 | 0.0018 |
The steel sheets of examples 1 to 3 of the present invention were subjected to mechanical property tests, and the test results are shown in Table 2.
TABLE 2 mechanical Properties of Steel sheets of inventive examples 1 to 4
As can be seen from the data in Table 2, the mechanical properties and the technological properties of the high-toughness weathering steel produced by the method provided by the invention meet the requirements of the agreement signed by the user, and the longitudinal impact energy of the steel plate at 0 ℃ is greatly improved by adding the rare earth La element, and the improvement ratio is about 70.23%.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. A method for improving the impact toughness of weathering steel is characterized in that: the process flow is as follows:
desulfuration → converter smelting → LF refining → RH refining → slab continuous casting;
heating a plate blank → descaling with high pressure water → a fixed width press → rolling with an E1R1 roughing mill → rolling with an E2R2 roughing mill → a heat preservation cover → cutting head and tail with a flying shear → descaling with high pressure water → rolling with an F1-F7 finishing mill → cooling with an encrypted laminar flow → thermal correction → shearing → flaw detection → sign → warehousing;
the main technological parameters are as follows:
1) And smelting in a converter
The molten steel for the casting machine comprises the following components: 0.06-0.11% of C, si:0.10 to 0.40%, mn:0.70-1.10%, P is less than or equal to 0.030%, S: less than or equal to 0.020%, cu:0.20-0.32%, cr 0.25-0.30%, ni:0.10-0.15%, rare earth La:15-25ppm;
2) Hot rolling of the steel
The discharging temperature of the casting blank is 1220 plus or minus 20 ℃, and the rough rolling adopts a 3+3 mode; the furnace time is 220-250min, the soaking time is 30-60min, the rough rolling finishing temperature is more than or equal to 1040 ℃, the finish rolling starting temperature is 930 +/-10 ℃, and the finish rolling finishing temperature is 840 +/-10 ℃; the thickness of the hot rolled steel strip is 12mm; laminar flow cooling equipment is adopted for cooling, a front dispersion cooling mode is adopted, and the coiling temperature is 580 +/-20 ℃.
2. The method for improving the impact toughness of weathering steel according to claim 1, characterized by: carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter; then, carrying out LF external refining on the molten steel smelted by the converter, and carrying out RH vacuum treatment on the molten steel after the LF external refining; carrying out slab continuous casting with the superheat degree of 18 ℃, and then carrying out slab cleaning, slow cooling and continuous casting billet quality inspection; obtaining a plate blank with the thickness of 250 mm; the heating temperature is 1210 ℃, the furnace time is 235min, the soaking time is 35min, the rough rolling finishing temperature is 1055 ℃, the finishing rolling starting temperature is 928 ℃, the finishing rolling temperature is 843 ℃, and the thickness of the finished steel plate is 12mm; the cooling rate of the steel plate is 10 ℃/s, and the coiling temperature is 583 ℃.
3. The method for improving the impact toughness of weathering steel according to claim 1, characterized in that: performing desulfurization pretreatment on molten iron, performing decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blowing converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter; then, carrying out LF external refining on the molten steel smelted by the converter, and carrying out RH vacuum treatment on the molten steel after the LF external refining; carrying out slab continuous casting with the superheat degree of 20 ℃, and then carrying out slab cleaning, slow cooling and continuous casting billet quality inspection; obtaining a plate blank with the thickness of 250mm, wherein the heating temperature is 1220 ℃, the furnace time is 228min, the soaking time is 34min, the rough rolling and final rolling temperature is 1055 ℃, the finish rolling initial rolling temperature is 932 ℃, the final rolling temperature is 846 ℃, and the thickness of the finished product steel plate is 12mm; the cooling rate of the steel plate is 9 ℃/s, and the coiling temperature is 590 ℃.
4. The method for improving the impact toughness of weathering steel according to claim 1, characterized by: carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of converter smelting, and adding scrap steel into the converter; then, performing LF external refining on the molten steel smelted by the converter, performing RH vacuum treatment on the molten steel refined outside the LF furnace, performing slab continuous casting, wherein the superheat degree is 20 ℃, and then performing slab cleaning, slow cooling and continuous casting slab quality inspection; obtaining a plate blank with the thickness of 250mm, wherein the heating temperature is 1223 ℃, the furnace time is 236min, the soaking time is 35min, the rough rolling final rolling temperature is 1058 ℃, the finish rolling initial rolling temperature is 933 ℃, the final rolling temperature is 846 ℃, and the thickness of the finished steel plate is 12mm; the cooling rate of the steel sheet was 9 ℃/s, and the coiling temperature was 592 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116732419A (en) * | 2023-05-31 | 2023-09-12 | 包头钢铁（集团）有限责任公司 | Production method of high weather-resistant coating-free steel for photovoltaic bracket |
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| CN114892082A (en) * | 2022-04-28 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 460 MPa-grade steel plate for ocean engineering and production method thereof |
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2022
- 2022-11-02 CN CN202211364603.0A patent/CN115927954A/en active Pending
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| JP2007186738A (en) * | 2006-01-11 | 2007-07-26 | Kobe Steel Ltd | Weather resistant steel sheet having excellent toughness in weld heat-affected zone |
| CN107557666A (en) * | 2017-08-30 | 2018-01-09 | 包头钢铁（集团）有限责任公司 | A kind of Q355NH rare earths weatherproof structure steel band and preparation method thereof |
| CN109576576A (en) * | 2018-11-22 | 2019-04-05 | 包头钢铁（集团）有限责任公司 | A kind of railcar of rare earth treatment Q450NQR1 fashioned iron and preparation method thereof |
| CN113061797A (en) * | 2021-03-16 | 2021-07-02 | 包头钢铁（集团）有限责任公司 | Improved production method of QStE420TM hot-rolled steel plate |
| CN113403460A (en) * | 2021-05-28 | 2021-09-17 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth treated low-temperature-resistant steel Q450EWR1 for railway carriage |
| CN114717482A (en) * | 2022-04-20 | 2022-07-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-yield-ratio rare earth titanium weathering steel and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116732419A (en) * | 2023-05-31 | 2023-09-12 | 包头钢铁（集团）有限责任公司 | Production method of high weather-resistant coating-free steel for photovoltaic bracket |
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